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These tmp files are working files for Office. They are created for various reasons like autosave or when save is clicked while the document is still open to preserve revision information. Sometimes, I should say a lot of times, the temp files get left behind.

Sometimes they can not be removed because the files are in a location which all users do not have permission to delete files. Then sometimes they are left behind for no apparent reason. If they are no longer in use, you can remove them. Be careful if the directory is shared by others who might be working with a file open. Personally, I look at the date of the file to determine if it can go.